/Engine/Source/Runtime/Analytics/AnalyticsET/Public/AnalyticsSessionSummaryManager.h
Cleans up all expired files that match the analytics session filename pattern. The manager automaticallly clean up if it runs, but if the analytics is off and the manager is not instantiated anymore, some dead files can be left over.
static void CleanupExpiredFiles ( const [FString](API\Runtime\Core\Containers\FString) & SavedDir )